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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814c5987da94e7e4cd45136edc7b0f590bb65ec6e618accc05242efc9259a3f4' 
  AND token = 'ttjzYjw5Juj5nmo1JEnxYIiZoBPh4JlaEmKpTAUMD+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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