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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6794e13f710b28a7a52b2687bf1621ee7b4e1d74ec3e8f787b50425d9c98ece5' 
  AND token = 'eoibiuRBzcgVnhIzIiiAjvbAeHt+7iFFPULvqDo6FNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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