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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ce93ca9c82d8c60840be7284e3719ac24ce4d88821d56e0598832e3a67d720' 
  AND token = 'wE8dwjOiY+zvA4tm2qvtvIhY21Nd4n6FZNfnZbEep9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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