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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968ac067f79d209be1673956f625c85f5e354e05a39ebdb20b6c25ddad2862d4' 
  AND token = 'jPvUKX7EoHlMRNiEjp355krtiWjTHrbpyIFofFEinDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00176

JSON explain

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