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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b19881417e494a4a8c90446365b9fa2526870e4ff9427aea497731af41cb6f' 
  AND token = 'jsvKsJ6jnCK7hRSicwWM8TzHeCmXn7+0WkG35NkitFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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