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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc399f8b44a49c39e1655f2f24948a7b410eda8ae9fe934b78c70974c26ae5b7' 
  AND token = 'm2Hai4x4nc8UOFpr/9B41gUFLlVch6LIj7Go7XgeuLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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