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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa0dcc91c1a7eb610bc8292fd761eb4a2b584c62e15d76ef77dbcf7e5e9cd36' 
  AND token = 'CU5qh78kjpb/NYv6J3f45g5M+7QAP3GaP9PeIEYDtKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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