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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fd2a2f0287685c0617aaccd93aa56f91328a9b07dd41c4e54037c0dda6e0c3' 
  AND token = 'NKrCJk/+QqS/0/OaLhl/pAr3t57KlAeubmC4j2OKHCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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