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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab86b7a34d3cee250cb18d0b1d537e60aace8accf7689b94f2880a18afdc2418' 
  AND token = 'lHoLL+SddDnuid2t8oVkCvOZM6wsVnCZDPhv07XJa84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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