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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82803338ed8df11d36a7f974e76c1d59c8894c8e6d78bd410119175ec90d810' 
  AND token = 'abtK4BJNy9gg+y6DpmNlujzkoeZ7Mx85VRfLL3eFrAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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