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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a16ae00b9e83d51c4bf2f8d52401d77220c49e8b5d40d4f91e4ea8bd2fa5e3e' 
  AND token = 'nARWn1nr6zxerU5IptsmNwuauGutDLotFV3h63v5my4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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