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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c155b00984b5f2341a98bba6f63020b0d9ef99b822fb41d796ce7babf72952f4' 
  AND token = 'kfaZN0UR5QaG1G4/PK3FXSyBC6RInRyt2DgM95jdYpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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