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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276b856d7529a93782deeacb939c1528887c6a35708c9f6981d81481fc9dce62' 
  AND token = 'JbxOTvYM4UyP/8z1vJ0mOOpH14/UmW3TuFz1LWxWilI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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