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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64770868527cb4b2c56c98679dd8083e30368685e68ecd7484167c8e025eab6' 
  AND token = 'oL1K4MNgrQE/5dy7T8KqW96FXBCae9qAsDLmezfpj7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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