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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7819311385335f8f4dda321d9f056686b2f02dfb95822c735aaf9dd0569f55e1' 
  AND token = 'CsD54x44nRrAFv2XqD2QFohyAS3kfb+eCPkJa19RnD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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