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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e56561174f6775a149adddc4f14b62149f514ece359f1ba005da574de9000b' 
  AND token = 'cPBwKTBOYqzgSeVCV2Eq24T6Baua7ww+3hUg+e214oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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