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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6180d935996acc87e5e2ff03a5c1af30d3720100f5276573f43d21529bcf8649' 
  AND token = 'nlCEpvp97q2hFHDuHfeISubcVH2zFwuZzM6jOLa3FJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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