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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8182ea27e02d7dc1b16c3082536d7b2460b76b09c0a8864f8f0fab3eb75f50cb' 
  AND token = 'ykTZURA76qOFKqURe7OR8V0Q6e1b8dGYpG1C4MZVAFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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