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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74436534fa4d2f6c0a19ab943cd03e9b10b735b5f0b618b24c7426a4429cef3f' 
  AND token = 'TNPU1gIC83httjnNUHfhmSYSrpys47BfRDuViB5ImSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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