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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eabef40b0c45d9e3740c49777a4e4c66e27d66edc5ab63c83d1bea84c89daea' 
  AND token = 'dgdWF/4pMuBRQLmR1m34ZdtagOcYvyTJZJeSIncj4qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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