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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa87ef30da317a6544d24d044f33cf773423bedfec14db815eb213a3c1fe66a' 
  AND token = 'nD6T0Alt8RznIBad2X9e5dGLU90CzW9p0Aj0aPi+xeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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