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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582cc38bdd523243f73b88a6a9ad04f8ac18ec3e9449668b98f31e4e5d90fc79' 
  AND token = 'Tckofkvcq9djlWDRWP6mwKs+3Q07aVxCvPxw8l2OQdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}