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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98ed929da4066476c81359fc0b9de82120c437c63c5a2829b142ce0ddc0e050' 
  AND token = 'TH4zcGf5TwLH0N6ZJA6L7NbZG2Ls/nNfSLn0hAwBA64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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