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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19b2c821cb854ac8c23cc9a7ab3d7a70fe19f9a71613ce271e4db49d29e5907' 
  AND token = '4dEM8IrbudiKBxK/wIWE+PkRCz6wfsWEg3vY7RAVFZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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