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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191ee55931a7373f3b08d33e431d8ed28324b6a9be254b78c854ded9f0d78ef0' 
  AND token = 'fbl4hwx/yefPW34nkJkTYlM3Uj3gGy7+vbYIcfEMslM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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