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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f919dee6b5e89b24fadaa5a667e711f84e860d05bf9d8a65623cd1373f3076b4' 
  AND token = '56EFhJoZX9b6aE1e0RXXiFOOspTR2jHZfZTrGlIJudI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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