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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d204932b24750b2bb4f03590f6331f779c39e8fa30c9828a90347dea52c1a3e' 
  AND token = 'OCLI7ayxoStF5QuE13QZnGHs7226OGjDrs7fcURWIfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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