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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0775a7b4b7e2a0f832bdde96f76276dafc5e79648d2b011902f7359ba090e6' 
  AND token = '1rxO63GDCOrKHLwYEn9WgARl2QVLm7ttqR3C9qC985s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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