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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e600efc6ddbae59fa677916a3ac1181f0fca271b6f8b357eed88a10742301a' 
  AND token = 'R3ZNmNaH028b5syRfhxAufclfKRuA20KaAvtzzgdJaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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