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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0475e6fb4486aaa85744d7953fd1120b84f280ceecd53e13ca9ec97f300a1ed4' 
  AND token = 'dGn6IjWqAsZOS5OSaiCdG+Up1wJTgpldxC29lNcYKd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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