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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abedef2f91586a1e74ea21d9a557b10bdd566ddaf03a4ad5be8f33b4c42cea2d' 
  AND token = 'cJ95Ze0F/fubM7biyA3+GQKh7oRXk0o6UwBtdUIkPYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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