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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7222314a1a3693a7c1d7443d40e402f205abe3b98e63120a2b238198e952c06d' 
  AND token = '6F+Z+sU+vkgc3T3WxXrsMQu7Q9/n2opu4j8cNR2wbDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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