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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ccfd286354a9866a88121bd63d2a93304a0ed29caab6e5a07981a31d8850b3' 
  AND token = 'bni66Cg6/vNpNKLn0WHWbGL3ShTOgfdlk72grz1Eqc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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