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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a8364bbe4d43755ef1f7b8ab904964ac7d79dce8468ac054bbc1efff1e555e' 
  AND token = 'NatWRtdZ2kaLoeVPg8n+9V42EAOc6EJpA17Azd4c0s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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