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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d548a84d01df22aea88f51dd14cd5b8fba366854a89aa11cc92251a987a8930' 
  AND token = 'cfmE3sLCYN/xKE23ci2yDuF+InHOcab9mXJvgua6qb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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