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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c83d813c1f792467a470735620ac8aa6ea2e1e8480f1373363760be714deb03' 
  AND token = 'YNuTiMwTxbIElS9sgumhvgaF+DGBW4ycBNWnTve1jls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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