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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5c1dd72218aad8eb3e2284cbb2118908f56e051a91115494911a289f7e1bcf' 
  AND token = 'el3l0O/ecbzAcodftMwhPKkA6dlRpsvCN/T12rq7cD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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