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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76fc1b455768228de934815f2953a5b830d93a7058e7d09d9d5ab2af7cbc060' 
  AND token = 'ksp//CDin2nJ2B+jZyjAh01Pk0XSN0G+PpxSpAy35ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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