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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4d0375a76463f52f9541d3d16197463c79ad5e7e2be6a02b2f2e3279d52e4d' 
  AND token = 'Q2rxNostkQ29bIND56MnIDo9T37Z9Iltqi7Xudvx44s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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