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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b68710f98966619cf6523d013b98e611d800856eea01131069474ef2f1ef48' 
  AND token = 'VtxtJ8G6Ry30tI163JciiqoAkgXF9h5aHHcLgmU+ht4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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