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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee357ee0cb79bdb4ae0777ded779125e87c64f936221b6528019cc5606677cd7' 
  AND token = 'J+2nKCPQF5mhw7DtigG6JEaIKgcLZVfeBhQ9fVfDETw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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