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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66784c5d2a991d0180404cdff677c2147b2f6ff36193edea661d0aae5e3f504' 
  AND token = 'GBbxRd8l5EXmhMnIZc4f7Hu0TGfv9rg7eEqummqd1Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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