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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7860c7c1213421e2cc60acad9edcc71d8a147af174e790afa2249808b201ff1' 
  AND token = 'WomGSZprg7vy79ZIMLdzOWj7XlLpFjBNkyfGDZ58Ckk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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