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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040125bb3e57b52ac269ae0969e02beecbd21db67d6679833b82b7673cdbcc4c' 
  AND token = 'B4Ha/krXPf6vpbtL/dR76IXPfifQ2EtWMjBHb/4hrYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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