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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908f878a2551d65be16a619fca82d35b614781b3b1ebaa1831706526eaccbd0f' 
  AND token = 'aScK2c1huoxqjZHIio3QYDvjzMVEZ7hCRwdiNpN11vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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