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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bade7c36009a458e9ae352360e508d0141472d103c06d9eca7613cda0edc4f81' 
  AND token = 'uMwOlr50xzD6uEKOc5b+r27Rg9fMBHSWpvlrPTdp1gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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