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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '486685a47bc48e0baab0b34b53a7209f249be19eb1cbbb56a4ea05ba22137c2c' 
  AND token = 'R/rkzERxdkbiyx3NNdm6bsHz/bFbINhFz/huJg/mKl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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