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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd24888af5f19cdb0287aed3ea579c32775cc587db6d3e421a2946f17a334e7d' 
  AND token = 'lSgMnDuh48Wy52Mqm8ms5BSZnm+lYsd6/aMzCoBdNHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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