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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c2e814ab466c8e47f1d6d043d8a7361be894319b4659162d35f89c0b320072' 
  AND token = 'SBs4jBeTlPcsopixHoQ57KSrVnVPIsQ4iUDbwYBCoOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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