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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631d9370e919e728871586cb763ae76a2412d39ada61cfd048f4cd4073f3117c' 
  AND token = 'lwfdilWL3FA7kfBL+/i6MEbp1s2fPiiHla8NuPYkvaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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