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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9255b56a954e16336aae1a88eebaa68475ba653f9333f6c89015fed1b6475264' 
  AND token = 'ccO2Swy+cLvwh11n9NeppArQWc0Y97sC/7rRE+0oefo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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