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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850704d26c0f4bb21b0298edeca9530400bed0c18babba8c1a6361acd8c415fc' 
  AND token = 'BoSuUu8uz9c6XyX8auiCy9lTxoN1m6u93c64nUyikG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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