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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea11fa17752b441bbde4e2d3ccb254ac48901e9c39037119739677596b74a11c' 
  AND token = 'GAgvz/enwkIDUvffaTApAx20+CkTxaOPZJgKq6PjQIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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