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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec216f55e2132b856e2b965b693b1436c6a40110665d1bb86cb858d21ad620b' 
  AND token = 'wJPKhqUKgsC2PBBQyLVG33Q322fA5Y+nO6fl12CJhnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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