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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a2c4025471a7ead62385996c57324a59d10df038e1cf28920c655cb35649c0' 
  AND token = 'BPKudhk54+cCqGdbytJaOenLuoaO5aKEMrNLDyR/k8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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