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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fd5878ece94de6ef0b13556f0ecea430b0823c1afd68e291e9c7a2d63ff737' 
  AND token = 'pIUdqRueKiW9cO1uDu9UdTdYMuPZozHnd4V+vVTaEbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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