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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc1822a4ac7ec22d793472d139d8f9764d6d6bf2ffdfbf323c17645de76f72f' 
  AND token = 'TOs3eT/uugq9jl/qtep5pON2x7gOodVipy30qpXEs6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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