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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5173b9c4cdb7d2e8dff9cd4b43514c3b5d334d9dc5812e85f20aec4cab8ffac' 
  AND token = 'Ny0S4mqqk5d8lQtvPBs0WQn4NYSghF+5xHdW4yEcxyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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